Burn 300 Calories in 20 Mins: Treadmill Climbmaster

This challenge is part of a series of workouts you can use to burn 300 calories in just 20 minutes. No more 'I don't have time to workout' excuses! The treadmill climbmaster routine is a heart pounding bonanza, so dont even think about attempting this unless your cardio is well conditioned. The routine is an interval run at 7mph that gradually increases the incline to 8 and then graduall...y back down to 0. If you survive this challenge, consider yourself a cardio rockstar!show more